If two of you are doing coding, what are the two other guys doing? What kind of value are they adding? Negotiate the equity based on the value you think you add

If two of you are doing coding, what are the two other guys doing? What kind of value are they adding? Negotiate the equity based on the value you think you add. I wouldn't even consider joining that kind of startup, I think 4 people is not manageable if everyone is working just for equity.